feat(logger): Add log level configuration (#1451)

Author: bcaudan

lib/cli.ts

@@ -100,6 +100,7 @@ let allowedNames = [
   'frameworkPath',
   'elementExplorer',
   'debug',
+  'logLevel',
   'disableChecks',
   'browser',
   'name',
@@ -134,7 +135,8 @@ let optimistOptions: any = {
     troubleshoot: 'Turn on troubleshooting output',
     elementExplorer: 'Interactively test Protractor commands',
     debuggerServerPort: 'Start a debugger server at specified port instead of repl',
-    disableChecks: 'disable cli checks'
+    disableChecks: 'Disable cli checks',
+    logLevel: 'Define Protractor log level [ERROR, WARN, INFO, DEBUG]'
   },
   aliases: {
     browser: 'capabilities.browserName',

lib/config.ts

@@ -565,6 +565,13 @@ export interface Config {
    */
   highlightDelay?: number;
 
+  /**
+   * Protractor log level
+   *
+   * default: INFO
+   */
+  logLevel?: 'ERROR'|'WARN'|'INFO'|'DEBUG';
+
   // ---------------------------------------------------------------------------
   // ----- The test framework
   // --------------------------------------------------

lib/logger.ts

@@ -54,6 +54,8 @@ export class Logger {
   static set(config: Config): void {
     if (config.troubleshoot) {
       Logger.logLevel = LogLevel.DEBUG;
+    } else if (config.logLevel) {
+      Logger.logLevel = LogLevel[config.logLevel];
     }
   }
 
@@ -139,7 +141,7 @@ export class Logger {
         }
         break;
       default:
-        throw new Error('Log level undefined');
+        throw new Error('Invalid log level');
     }
   }